Elmo DBP SERIES manual Digital position and speed control, Control Modes Holding Modes Start Modes

20

Ip - Iop

Tp = 2.2ln ----------

Ip - Ic

Iop - Actual operating current before the peak demand.

The result of this filter is that the maximum peak can last for a maximum of

2 seconds. A lower peak can last longer.

Example: A motor is driven by an DBPF-10/135 amplifier at constant speed and constant current of 5A. What is the maximum possible duration of a 20A peak ?

20 - 5

Tp = 2.2ln -------- = 0.892 seconds

20 - 10

4.4 Digital position and speed control

The DCB accepts motion commands via an RS232 or RS485 communication line and receives position feedback in an incremental encoder format either from an encoder or from the resolver/digital circuit. The DCB derives the closed-loop position error by comparing the command position and the feedback position. The error is processed by a digital filter to yield with an analog motor command. The analog +5 volt range motor command is then amplified by the power amplifier.

Following is a summary of all the operating modes of the DCB and a detailed discussion of each of them.

Control Modes

Holding Modes.

Start Modes

Program Mode

Termination Modes

Status reporting

Define origin modes

DBP - Rev 6/93